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      函数柯里化及其使用到的案例
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        <h1 id="函数柯里化"><a href="#函数柯里化" class="headerlink" title="函数柯里化"></a>函数柯里化</h1><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span 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class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!doctype <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span> <span class="attr">lang</span>=<span class="string">&quot;en&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">&quot;viewport&quot;</span></span></span><br><span class="line"><span class="tag">          <span class="attr">content</span>=<span class="string">&quot;width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">&quot;X-UA-Compatible&quot;</span> <span class="attr">content</span>=<span class="string">&quot;ie=edge&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>Document<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line">    /**</span><br><span class="line">     *  定义:</span><br><span class="line">     *  在计算机科学中，柯里化（Currying）是把接受多个参数的函数变换成接受一个单一参数(最初函数的第一个参数)的函数，</span><br><span class="line">     *  并且返回接受余下的参数且返回结果的新函数的技术。</span><br><span class="line">     *</span><br><span class="line">     *  好处:</span><br><span class="line">     *      1.实现参数单一传入 实现参数复用</span><br><span class="line">     *      2.缓存函数执行的参数 ,减少重复计算 = &gt; 延迟计算 (延迟处理某些任务,因考虑到后面还有其他的任务)</span><br><span class="line">     *</span><br><span class="line">     *  使用场景:</span><br><span class="line">     *      1.比如说再一些需要动态传参的场景下使用,就是函数需要执行的参数可能还不能确定</span><br><span class="line">     *      2.多次操作任务, 可以先把前面的任务暂存 ,等到最后一次执行时,先判断之前的任务是否还具有执行的意义,如果没有意义就不执行</span><br><span class="line">     *      3.浏览器的兼容性的检测, 按照常规,会写一个兼容性处理方法,(不使用柯理化,需要每次调用都要检测一次) ,柯理化后就可以优化整个流程,每次页面加载只检测一次</span><br><span class="line">     *  调用方式:  curry(a)(b)(c)(d)</span><br><span class="line">     */</span><br><span class="line"></span><br><span class="line"><span class="javascript">    <span class="comment">//封装一个加法计算的函数</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// function add(a,b)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     return a+b;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// //原来的想法</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// var num1 = add(10,20);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// var num2 = add(10,30);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// //定义一个柯理化函数 ((柯理化))</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// function curryAdd(a)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     return function(b)&#123; // 闭包</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         return add(a,b);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// var first = curryAdd(10);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     console.log(first(20));  // =&gt;  30</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// // console.log(first);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// //使用柯理化之后</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// var num3 = first(20);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// var num4 = first(30);</span></span></span><br><span class="line"></span><br><span class="line"><span class="javascript">    <span class="comment">//实现一个可以计算多个数字的之和的方法</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// function add()&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     // console.log(arguments);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     //为了避免计算错误 ,判断是否带有参数</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     if(!arguments.length)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         return 0;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     var args = [].slice.call(arguments); //为了借数组的方法</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     return args.reduce(function (item,total) 			&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         return total+=item;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     &#125;)</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     // console.log(args);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     //arguments 伪数组 ,就是传入方法中的参数的集合</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     // console.log(arguments.length);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// &#125;</span></span></span><br><span class="line"></span><br><span class="line"><span class="javascript">    <span class="comment">// var num = add(10,20,50,3,50,60,40,50,30);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// var num = add();</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="javascript">    <span class="comment">// function fn()&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// &#125;</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="javascript">    <span class="comment">//柯理化后</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// function curryAdd(fn)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     var nums = [];//用于缓存调用时存储进来的参数</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     return function fn(a)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         if(arguments.length)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//             var args = [].slice.call(arguments);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//             // nums.push(a);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//                 nums = nums.concat(args);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//             console.log(nums);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//             return fn;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         //如果执行该方法时,已经不带参数 ,则直接计算所有存储的参数 ,一次计算(合并计算)</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         console.log(&quot;不带参数时,表示该计算结果了!&quot;);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         return add.apply(null,nums);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// var ss = curryAdd(); // ss  == fn</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     ss(10);  //可能后面还有数字需要一起计算 ,所以此时的函数暂时先不计算 ,可以把参数暂时缓存nums中</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     ss(20)(10,50)(50,10);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     console.log(ss());</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="javascript">   <span class="comment">//缓存功能</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//传统做法: 不足就是 ,每次通过addEvent() 做兼容性的绑定时间 ,都会把内部的判断逻辑执行一次 ,如果需要绑定三个事件 ,就需要执行三次 兼容性检测</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// function addEvent(type,el,fn,capture = false)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     if(window.addEventListener)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         el.addEventListener(type,fn,capture);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     &#125;else if(window.addachEvent)&#123;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//         el.addachEvent(&quot;on&quot; + type,fn);</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">//     &#125;</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// &#125;</span></span></span><br><span class="line"></span><br><span class="line"><span class="javascript">        <span class="comment">//柯理化之后的 : 使用addEvent 函数做兼容绑定事件 ,只需要检测一次兼容性,后面就直接使用缓存的结果去绑定事件 ,如果绑定三个事件,其实只检测一次兼容性</span></span></span><br><span class="line"><span class="javascript">    <span class="keyword">var</span> addEvent = (<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">        <span class="keyword">if</span>(<span class="built_in">window</span>.addEventListener)&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params">type,el,fn,capture</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">var</span> capture = capture || <span class="literal">false</span>;</span></span><br><span class="line">                el.addEventListener(type,fn,capture);</span><br><span class="line">            &#125;</span><br><span class="line"><span class="javascript">        &#125;<span class="keyword">else</span> <span class="keyword">if</span>(<span class="built_in">window</span>.attachEvent)&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params">type,el,fn</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                el.attachEvent(<span class="string">&quot;on&quot;</span> + type,fn);</span></span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;)();</span><br><span class="line"></span><br><span class="line"><span class="javascript">    <span class="built_in">console</span>.log(addEvent)</span></span><br><span class="line"><span class="javascript">    <span class="comment">// addEvent(&quot;click&quot;,document.getElementById(&quot;box&quot;));</span></span></span><br><span class="line"><span class="javascript">    <span class="comment">// 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<h4 id="函数柯里化复习版"><a href="#函数柯里化复习版" class="headerlink" title="函数柯里化复习版"></a>函数柯里化复习版</h4><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span> <span class="attr">lang</span>=<span class="string">&quot;en&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">&quot;viewport&quot;</span> <span class="attr">content</span>=<span class="string">&quot;width=device-width, initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">&quot;X-UA-Compatible&quot;</span> <span class="attr">content</span>=<span class="string">&quot;ie=edge&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>Document<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//首先定义一个相加的方法方便下面调用</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">// function add(a,b)&#123;</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">//     return a+b;</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">// &#125;</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="javascript">        <span class="comment">// // 一个最简单的例子</span></span></span><br><span class="line"></span><br><span class="line"><span class="javascript">        <span class="comment">// function curryAdd(a)&#123;</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">//     return function(b)&#123;</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">//         return add(a,b);</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">//     &#125;</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">// &#125;</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">// // console.log(curryAdd(10));</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">// var first = curryAdd(10);//这个10代表a是第一层</span></span></span><br><span class="line"><span class="javascript">        <span class="comment">// console.log(first(50));//50已经是第二次调用就是第二层</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="javascript">        <span class="comment">//实现多个数字相加(利用到数组的方法reduce)，但是没使用函数柯里化每次都会出结果，相当于计算重复了多次</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">add</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="built_in">console</span>.log(<span class="built_in">arguments</span>);<span class="comment">//arguments是伪数组，浏览器自带</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">if</span>( !<span class="built_in">arguments</span>.length )&#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">return</span> <span class="number">0</span>;</span></span><br><span class="line">            &#125;</span><br><span class="line"><span class="javascript">            <span class="keyword">var</span> args = [].slice.call(<span class="built_in">arguments</span>);<span class="comment">//arguments是伪数组没有数组的方法，利用call方法借用数组的slice方法</span></span></span><br><span class="line">            </span><br><span class="line"><span class="javascript">            <span class="keyword">return</span> args.reduce(<span class="function"><span class="keyword">function</span>(<span class="params">item,total</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">return</span> total +=item;</span></span><br><span class="line">            &#125;);</span><br><span class="line">        &#125;</span><br><span class="line"><span class="javascript">        <span class="comment">// console.log(add(10,50,80));</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="javascript">        <span class="comment">//然后利用到函数柯里化来实现多个数字相加</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">curryadd</span>(<span class="params">fn</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">var</span> nums = [];<span class="comment">//定义一个空的数组来存储写入需要相加的数字</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> <span class="title">fn</span>(<span class="params">a</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">if</span>( <span class="built_in">arguments</span>.length )&#123;</span></span><br><span class="line"><span class="javascript">                    <span class="keyword">var</span> args = [].slice.call(<span class="built_in">arguments</span>);</span></span><br><span class="line"><span class="javascript">                    <span class="comment">// nums.push(a);</span></span></span><br><span class="line"><span class="javascript">                    nums = nums.concat(args);<span class="comment">//因为nums是外面一层变量加了return可以返回出去，所以把里面的数字合并给nums</span></span></span><br><span class="line"><span class="javascript">                    <span class="built_in">console</span>.log(nums);</span></span><br><span class="line"><span class="javascript">                    <span class="keyword">return</span> fn;</span></span><br><span class="line">                &#125;</span><br><span class="line"><span class="javascript">            <span class="keyword">return</span> add.apply(<span class="literal">null</span>,nums)</span></span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="javascript">        <span class="keyword">var</span> adds = curryadd();</span></span><br><span class="line"><span class="javascript">        adds(<span class="number">10</span>,<span class="number">10</span>)(<span class="number">10</span>);<span class="comment">//柯里化把需要计算的数字先存好</span></span></span><br><span class="line"><span class="javascript">        <span class="built_in">console</span>.log(adds());<span class="comment">//最后一次计算，提高性能</span></span></span><br><span class="line">        </span><br><span class="line">    <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>


      
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